it depends what type but the average space saver weighs less than 10kg while an actual tyre could weigh up to 30.
25 to 30 lbs.
It depends - .454 kilograms = 1 pound Cars are usually about between 1 or 2 tons I think. 2,000 pounds = 1 ton. (100 pounds = 1 hundredweight & 20 hundredweight = 1 ton) 908 kilograms = 1 ton, so...
By 'average' I doubt very much that you mean Ferrari. Affordable, common, sports cars that are mass-produced could be expected to weigh ~1500kg.
Current 2008 F1 cars are 1 million pounds.